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Role of Oxidation of XRCC1 Protein in Regulation of Mammalian DNA Repair Process

I A Vasil'eva1, N A Moor1, O I Lavrik2

  • 1Institute of Chemical Biology and Fundamental Medicine, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia.

Doklady. Biochemistry and Biophysics
|March 5, 2020
PubMed

Insights

Oxidation of XRCC1 protein impacts DNA repair by altering poly(ADP-ribose) modification. This study reveals how XRCC1 oxidation fine-tunes protein interactions and repair efficiency.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • XRCC1, PARP1, and PARP2 are crucial scaffold proteins in DNA repair.
  • These proteins coordinate multistep repair of common DNA lesions.

Purpose of the Study:

  • To investigate the influence of XRCC1 protein oxidation on poly(ADP-ribose) modification.
  • To understand the regulatory role of XRCC1 oxidation in DNA repair pathways.

Main Methods:

  • Studied protein oxidation and its effect on ADP-ribosylation.
  • Investigated protein-protein interactions using XRCC1 and DNA polymerase β (Polβ).
  • Assessed the impact of oxidation on PARP1 and PARP2 automodification.

Main Results:

  • XRCC1 oxidation reduces its ADP-ribosylation efficiency and affinity for poly(ADP-ribose).
  • DNA polymerase β enhances ADP-ribose modification of XRCC1.
  • Oxidized XRCC1 and its Polβ complex suppress PARP1/PARP2 automodification, potentially improving repair.

Conclusions:

  • XRCC1 oxidation fine-tunes poly(ADP-ribosyl)ation levels in DNA repair.
  • Oxidation modulates the coordinating functions of XRCC1, PARP1, and PARP2 in DNA repair.

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